Fuel pump of internal-combustion engines



June 10, 1930. J. MAHLER FUEL PUMP 0 INTERNAL COMBUSTION ENGINES Filed April 11, 1925 Qttarz: E 5

Patented June 10, 1930 T oF FicE "JI'OHAITN manrnmpr AUGSBURG, GERMANY", ssrenoza TO THE rmmirmsonmnn FABRIK AUGSBURG-NUERNBERG, AKTIENGESELL'SCHAF A CORPORATION OF GERMANY r, QFYAUGSBURGQ GERMANY,

' FUEL rvmror INTERNAL-COMBUSTION ENGINES 1 This invention relates to fuel pumps for" internal combustion engines operating wlth solid fuel injection.

It is one of the principal objects ofthis invention to provide a fuel pump of this type having an efficient regulating means.

It is another object of this invention to provide a fuel pump having means for collecting the fuel leakage in said pump, and

for returning the-collected fuel'to"a reservoir. I

These and other objects of the invention will be apparent from the following descri'ption taken in connection with the ac- To regulate the degree of fuel pumps for internal combustion engines,

' fulcrum of the driving it is awell known fact that the fulcrum of the lever which influences the cut-off or relief valve mu'st be adjusted. It further known that the admissionof fuel can be regulated in a similar Way by adjusting the lever ofthe pump.

This invention uses oth these regulating arrangements'and connects the two regulat ing levers which are mounted on eccentric shafts and which influence the c'ut-ofi" or relief valve and the puinp plunger by a link- 7 age which transfers the movement from the justment of the degree of fuel admission cam-shaft to thepurnp plunger, and at the same time 3 also allows an independent ad- I as Well as the beginning or time of the fuel injection. v

The pump drive is enclosed in a casing,

'- and the pump casing is usedto collect the fuely which leaks past the pump plunger and the relief valves and is led from there to a reservoir for further use. I

The invention is illustrated in the accompanying drawing, in which the single figure is a vertical section through'the fuel pump, and in. which a is the pump plunger, .b? the relief' valve of the fuel pump and c the driving cam of the pump. Between this cam disc and the pump plunger, two regulating levers 'd and el-are arranged, which are mounted or advancesthe relief valve 6. "e, however,' can in a similar way be adadmission with valve t.

Application file d April 11, 1925, Serial No. 22,375, arid in Germany May 9, 1924.

age' h: The lever dQis used to regulate the amount 'or degree of fuel admission'by turning the sh afting f by means of a governor, the fulcrum of the lever being either raised or' lowered in the direction of the arrow so that the stop fi either retards justed longitudinally by turning theshaft g so as to advance or retard the engagement of the roller 5' bythe curve or rise of the cam disc, thereby'altering, the beginning of the fuel admission, with relation to the stroke or cycle of engine oper-- ation.

During operation of the pump, fuel is admitted to the pump chamber fromthe suc- The lever, 4

tion chamber w controlled by asuction- On the suction or down stroke of the pumpplunger a the suction valve t opens'to admit fuel.

A At the commencement of the pressure or up stroke of the plunger the relief valve b,

-is closed and consequently the plunger w serves to immediately force fuel through the passage r to the engine cylinders. This action is rendered possible by virtue of the particular form of driving mechanism disclosed, the rise of the earn a being such that the pump plunger. is immediately given a substantially constant speed ,of such velocity that the injection fuel is at once placed under conditions vof pressure suitable for injection. Consequently the injection may commencesubstantially .at the beginning of the pumping stroke, thereby obviatingthe l necessity of relief mechanism for by-passing -'the fuel at the beginningof the stroke and 'while the plunger is being brought'up to such speed as will insure suitable pressure throughout" the injection period. The inment of stop 71 with relief valve 5 to jection of fuel is terminated by. the engageraise the latter sothat during the remainder of the pressure stroke of the plunger .a the fuel is by-passedinto the chamber s,*-L

from whencelit pasi ssthrough pressure-op 'erated valve ,utinto the relief or overflow chamber 1) from where i't-is returned to the i an ently adjustable.

drive is enclosed in the casing k, the under part Z of which is arranged fuel supply or reservoir any desired manner.

It to be noted that the pivot of the lever dJ is adaptedto be moved ina vertical direction and has substantially no horizontal movement when the shaft f is rotated to adjust the same. This movement is indicated by the arrows to the left of the. shaft f. This provides a means for raising or lowering the stop v7 without imparting appreciable movement'to the link it. On the other hand the pivot of thelever e is arranged to be moved in a-horizontal direction upon rotary adjustment of the'shaft g, so that this movement can take place without appreciably afiecting the vertical position of the link.k or the lever d.

This movement of the lever. e is indicated.

by the arrows below the shaft g., An advantage of the present invention isthat. by

adjusting shaft g, it is possible to advance ,or retard the admission of fuel with relation to the stroke or cycle of engine opera-I tion, Without in any way affecting the amount or degree of fuel admission. Further, adjustment of the shaft"f operates through parts at and i tovary-the point of cut-off of "the fuel, and hence the amount or degree of admission of the fuel to the engine without in any way affecting the beginning of the fuel admission with rela-. tion to the cycle of engine operation. The.

beginning-or time of fuel injection and the degree of fuel admission are thus independ- The pump for receiving the fuel which leaks past the pump plunger a and the relief: Valve 6.

40 The fuel which is thus collected is led by the piping m' into the reservoir n. Having now described .my said nvention, whatIclaim as'new is:

1. A fuel pump for solid injection of fuel 4.5 to an internal combustion-engine, comprising means for controlling the beginning of fuel injection, and means for controlling the degree of fuel admission, said means i11 eluding a, plurality of adjustable members, a pump plunger actuated from one of said members, eccentric means. for readily adjusting said member to vary the timing of the operation of said plunger, a cut-off valve actuated byfanother of said members, andmeans for actuating said members, both of said members being interposed between said actuating means and said pumjp plunger to" transmit actuating movement to said pump I plunger.

fuelpump for an internal combus terminating the injection period and thereby controlling the degree of fuel admission,

tion engine of the character described, comprising a pump plunger for feeding fuel to said engine, the beginning of stroke of said pump plunger determining the .beg1nmng of fuel injection, a relief valve forterminating the injection period and thereby con-.

, trolling the degree of fuel admission, a cam- ,shaft for operating said pump plunger and relief valve, and adjusting means interposed between the plunger and the cam-shaftfol' varying the time of fuel .injection in relation to the cycle of engine operations and independently varying thetiming of the relief valve, said adjusting means comprising-a pair of substantially parallel adjacent arms each. eccentrically mountedat. one end, an operable interconnection at their other ends, and means for adjusting the eccentric mountings to move the pivot axes in directions at substantially right angles to each other, the eccentric mountings being located substantially in a line parallel to the pump plunger' and at right angles to'the said arms.

4.'A fuel pump for solid injection of fuel to an internal combusionengine, comprising means for independently controlling the I beginning of fuel injection and the degree v of 'f1iel admission, said means including a pair of adjustable members, a pump plunger actuated by said members,.a cam for actuating interposed between said camand said ing said'members, both of saidmembers bepump plunger and both effective to -t-ransmit actuating movements to sa1d pump plunger, and means for adjusting one of said members to adjust the" beginning of fuel injectionwithoutafl'ecting the degree of fuel admission.

In testimony whereof signature. 1 a.

7 JOHA'NN MAHLER.

tion engine of the character-described, comprising a pump plunger for feeding fuel to said engine, the beginning ofstroke of said pump plunger determining the begin v65 ning of fuel injection, a relief valve for I haveafiiized my I 

